Stoker construction



Dec. 29, 1936. 1 BEERS 2,065,552

STOKER CONSTRUCTION Original Filed Oct. 10, 1932 4 Sheets-Sheet l Dec.29, 1936. I R. L. BEERS STOKER CONSTRUCTION Origifial Filed Oct. 10, 1932 4 Sheets-Sheet 2 I "Z CZHBcens R. L. BEERS- STOKER CONSTRUCFI'IONDec. 29, 1936.

4 Sheets-Shet 3 Original Filed Oct. 1 0, 1932i Elma/Mun Ro% e 1.3eersDec. 29, 1936. 1.. BEERS' 2,065,552

STOKER GON S TRUCTI ON Original Filed Oct. 10, 1932 4 Sheegs-Sheetj4 I!Q. I

34 eel. 'zaers Patented Dec. 29, 1936 PATENT OFFICE" STOKER CONSTRUCTIONRoyce L. Beers, Detroit, Mich, assignor to Detroit Stoker Company,Detroit, Mich., a. corporation of Michigan Application October 10, 1932,Serial No. 637,186

Renewed May 8, 1936 23 Claims. (01. 110 115) This invention relatesgenerally to stokers of the sprinkler type and consists of certain novelfeatures of construction, combinations and arrangements of parts, thatwill be hereinafter more fully described and particularly pointed out inthe appended claims.

In, the accompanying drawings:

Figure 1 is a vertical sectional View through a furnace and showingstoker mechanism embodying my invention applied thereto;

Figure 2 is a sectional view taken on the line 2-2 of Figure 1;

Figure 3 is a sectional view taken on the line 33 of Figure 1;-

Figure 4 is a sectional view taken on the line 4-4 of Figure 1;

Figure 5 is. a sectional view taken on the line 5-5 of Figure 2;

Figure 6 is a detail view of the rotor drum;

Figure 7 is a sectional view taken on the line 1-1 of Figure 6;

Figure 8 is a detail view of one of the bames;

Figure 9 is a detail view of the base plate;

Figure 10 is a detail view of one of the side 25 plates;

Figurell is a detail view of the other side plate; p

Figure 12 is a detail view of one of the air ducts to the apron tuyres.

' Referring now to the drawings wherein I have illustrated oneembodiment of my invention, A is the front plate; B is the base plate; Cand D respectively are the side plates; E and F respectively are thefront and rear cross plates; and 3 G is the cover plate. V

H are bafiles for the side plates; I is a shaft journaled in bearings Jcarried by the side plates; K is a rotor drum fixed upon the shaft Ibetween the baflles H; and L are blades fixed to the drum K. M is a 'panprojecting forwardly from the base plate B at the lower edge I of theopening 2 therein and having a curved bottom 3 substantially coaxialwith the shaft I, and N is a curved plate secured upon and cooperatingwith the curved bottom of the pan to form a housing' forthe rotor drumK. Inthis connection it will be noted that the plate N and pan M arebolted together and that the pan detachably engages the base plate B,hence the pan may be readily removed when desired to aiford access toand replacement of the blades L.

0 is a hopper for green fuel mounted upon the plates C, D, E and F; P isan adjustable plate over which the green fuel from the hopper may beadvanced by. a suitable ram or feed plate Q so that such fuel will befed onto and will be projected rearwardly in spray form by the blades Lon the rotating drum K.

R are deflector plate sections extending upll wardly and rearwardly fromthe rear edge of the rear cross plate F to the upper edge 5 of theopening 6 in the front plate A; S is an apron extending downwardly andrearwardly from the lower edge l of the opening 2 in the base plate B;and T is a supporting plate for the apron. U is the dead plate and V areair ducts carried by said dead plate for conducting air from the windchamber W to the space l0 between the supporting plate T and apron "S.Preferably the apron S comprises a series of tuyre blocks ll arrangedside by side and having inlet and. outlet openings I2, l3 and Mrespectively for air,

and thepan 'M is provided at opposite ends there- 'of with rearwardlyextending ducts, l5 and 16 for air from the space H). In order that suchair may be used to cool the bearings J and as-' sist in the combustionof fuel within the furnace, the baffles H for the side plates areprovided with passages l1 and I8 respectively that are adapted toreceive air from the ducts I5 and IS in the pan and to discharge it intothe furnace just below the deflector sections R. In this connection itwill also be noted that the rotor drum K is hollow and is provided withopenings l9 and 20 respectively. Preferably the openings I9 are of thekeyhole type and are adapted to receive suitable bolts 2| constitutinganchorage stricted or narrow parts of the openings l9. Preferably thebases 22 of the blades L are recessed as at 23 for registering withthelarger parts of the openings l9 and have lateral outlet passages 24 forsaid air. Consequently the air from the ducts l5 and I6 will be drawnthrough the openings 20 in the ends of the drum and will flow throughthedrum and out through the openings l9, recesses 23 and passages 24 tothe space about the drum in the housing therefor. As a result the rotordrum is air cooled. Due to the rotation of the drum and theconfiguration of the pan M and drum housing the air is admitted at highvelocity so that fine particles of the fuel are blown into the furnaceand. are

prevented from settling at the front end of the grates X. Thus this airserves both the purpose of combustion and distribution of the fine fuel.In use, the fuel from the hopper 0 will be wardly in the furnace by theblades L on the romoved by the ram Q rearwardly on the plate P so thatit will fall upon and be projected reartating drum K. Once within thefurnace the flne fuel is burned in suspension and the coarse fuel isburned on the grates X. The apron S catches the fine material, dust,etc. However, such apron is cooled by the air from the space Ill,hence-will not burn out. Preferably the air is supplied to the windchamber W by a blower or fan (not shown), consequently the properpasrage of air through the ducts V, apron sections i I, ducts I5 and i6, rotor drum K and passages I!. and i8 will be provided while thestoker is in operation.

What I claim as my invention is:

1. In a stoker, an upright plate attachable to the front of a furnaceand having an opening therein through which fuel may be propelled intothe furnace, a rotor housing in front of said plate and dischargingrearwardly through said'opening, a chamber for air in rear of saidplatejust below said opening, the top of said-chamber being inclineddownwardly and rearwardly and forming an apron for said opening,.saidapron having means for conducting air from the chamber rearwardly intothe furnace and forwardly through the openingaforesaid into the housing,

- through which fuel may be propelled into the furnace, a rotor housingin front of said plate and discharging rearwardly through said opening,a rotor within said housing for propelling fuel through the opening, achamber for air in rear of said plate just below said opening, and

means for conducting air to said chamber, the

top of the chamber inclining downwardly and rearwardly from the loweredge of the opening therein through which fuel may be propelled into thefurnace, a rotor housing in front of said plate and discharging throughsaid opening, a rotor within said housing adapted to propel fuel throughsaid opening, a chamber for air in rear of said plate just below saidopening, the top of said chamber inclining downwardly. and rearwardlyfrom the lower edge of said opening and forming an apron for fuelpropelled throughthe opening, means for conducting air to said chamber,and means for conducting air from the chamber into said rotor housing.

4. In a stoker, an upright plate attachable to the front of a furnaceand having an opening therein through which fuelmay be propelled intothe furnace, a rotor housing upon the front of the plate and dischargingthrough said opening, a rotor within said housing adapted to propel fuelthrough said opening, and a chamber for air upon the rear of the platejust below the opening, the top of said chamber-inclining downwardly andrearwardly from said opening and forming an apron for fuel propelledinto the 5. In a stoker, an upright plate attachable to the front of afurnace and having. anopening through which fuel may be propelled intothe furnace, a rotor housing projecting forwardly from said plate anddischarging through said opening, a rotor .within the housing adapted topropel fuel through the opening, an air chamber in rear of said, plate'just beneath said opening, a dead plate in rear of said upright platebeneath the air chamber, means extending through the dead plate andconducting air to the chamber, and means for conducting air from thechamber to'the interior of the rotor housing.

6. In a stoker, an upright plate attachable the front of afurnace andhaving an opening through which fuel maybe propelled into the furnace, arotor housing in front of the plate discharging into said opening, arotor withinthe housing adapted to propel fuel through the opening, andan apron inclining downwardly and rearwardly. from the lower edge oftheopening aforesaid, said apron comprising a series of elongated tuyreblocks arranged side by side, said blocks being provided inadjacentedges at their lower ends with outlets for air, provided at theirperiphery of the rotor having a recess opening toward the periphery andcooperating therewith to form a chamber for air, said chamber being incommunication with the radially. extending pas-' sage aforesaid andhaving an' outlet passage adjacent the periphery of a said rotor.

8. In a stoker, an upright plate attachable to the front of. a furnaceand having an opening therein through which fuel may be propelled intothe furnace, a rotor housing projecting forwardly from said plate anddischarging rearwardly through said opening, a chamber for airprojecting rearwardly from said plate beneath the fuel opening therein,the top of said chamber inclining downwardly and rearwardly fromthelower edge of said opening and constituting an apron, said inclined topbeing provided-with means for discharging air rearwardlyinto thefurnace, and means for conducting air from the chamber for-- wardlybeneath the fuel opening aforesaid to the interior of said housing, tobe propelled with fuel rearwardly through saidopenings.

9. In -a.stoker, an upright plate attachable to the front of a furnaceand having an Opening therein through which fuel may be projected intothe furnace, a rotor housing projecting forwardly from said plate anddischarging rearand having flanges projecting laterally therefrom towardand cooperating with the side plates to form passages for air leadingfrom the inlets aforesaid toward the opening in the upright plateadjacent the bearings.

10. In a stoker, a rotor housing having side plates, a rotor shaftwithin said housing and extending through said plates, bearings for saidshaft mounted upon the outer sides of said plates, baflle plates mountedupon the inner sides of and substantially parallel to said side plates,said baffle plates having flanges projecting laterally therefromtowardand cooperating'with the side plates to form air passages adjacentthe bearings for cooling purposes, said bafile plates having openingsreceiving said shaft, a hollow substantially cylindrical blade carryingrotor having ends fixed to said shaft and disposed within the openingsin said baffle plates, the ends of said rotor having air passagesestablishing communication between the interior of the hollow rotor andthe air passages aforesaid.

11. In a stoker, an upright plate attachable to the front of a furnaceand having an opening therein through which fuel may be propelled intothe furnace, a rotor housing projecting forwardly from said plateanddischarging through said 7 opening, said housing having a pair ofside plates and provided at the, bottom thereof upon the inner sides ofsaid side plates with air'inlets, and baflie plates upon the inner sidesof and substantially parallel to said side plates, said baflle plateshaving flanges projecting laterally therefrom to-- ward and cooperatingwith the side plates to form air passages leading from the inletsaforesaid toward the opening in said upright plate.

12. In a stoker, a rotor drum having connecting axially and radiallyextending passages for air,

blades having 'bases upon the periphery of the.

drum; said bases having recesses opening toward and cooperating with theperiphery of said drum to form air chambers in communication with saidradially extending passages, said chambers having air outlets adjacentthe periphery of said drum, and securing means for the blades extendingthrough said bases and said radially extending passages. 1

13. In a stoker, an upright plate attachable to the front of a furnaceand having an opening therein through which fuel maybe propelled intothe furnace, a rotor housing in front of said plate and dischargingrearwardly through said opening, and a chamber for air in rear of saidplate just below said opening, the top of said chamber forming an apronfor said opening, said apron having means for conducting air from thechamber rearwardly into the furnace and forwardly.

. wardly fromsaid upright plate and discharging rearwardly throughsaidopening, and apron j tuyeres inclining downwardlyand rearwardly from thelower edge of the opening in said upright plate, said tuyres havingmeans for discharging air rearwardly into the furnace and other meansfor conducting air forwardly through ,the opening aforesaid into saidhousing to be propelled-with fuel rearwardly through said opening.

p 15. {In a.

wardly into the furnace, a rotor housing projectbeing inclineddownwardly and rearwardly and stoker, an upright plate attachable; tothe front of a furnaceand having an opening ing therein through whichfuel may be projected into the furnace, a substantially trough-shapedhousing projecting forwardly from said plate and discharging throughsaid opening, said housing being provided at the bottom thereof withmeans for receiving air from a point in rear of the upright plate, saidhousing having side plates and baflie plates mounted upon andsubstantially parallel to said side plates, said baflle plates havingflanges projecting laterally therefrom toward and cooperating with theside plates of the housing to form passages for conducting air from'thereceiving means aforesaid toward the opening in said upright plate.

17. In a stoker, an upright plate attachable to the frontof a furnaceand having an opening therein through whichfuel may be projected intothe furnace, a rotatable blade-carrying drum in front of said plateadjacent the opening therein, a housing for the drum projectingforwardly from said plate and discharging through said opening, saidhousing having side plates, bearings carried by the side plates of saidhousing, a shaft forsaid drum journaled in said bearings, baiile Iplates substantiallyparallel to the side .plates of ing with the sideplates of the housing to provide. therebetween passages for airextending from points :adjacent the bottom of the housing to pointsadjacent the opening in the upright plate,

and means associated with said housing for conducting air to saidpassages.

18. In a stoker, an upright plate attachable to the front of a furnaceand having an opening therein through which fuel may be propelled intothefurnace, a substantially trough-shaped housing projecting forwardlyfrom said plate and discharging rearwardly through said opening, saidhousing havingside plates and being provided at the bottom, thereof withinlets for air bearings carried by the side plates of said housing, ashaft journaled'in saidbearings, a blade-carrying drum sleeved upon andrigid with said shaft between ,-the side plates of said housing, and"means associated with the side "plates of said housing for conductingair from said inlets at the bottom of the housing past the bearingstoward the opening in said upright plate.

19. In a; stoker, anupright plate attachable to the front of a furnaceand having an opening therein through which fuel may be propelled intothe furnace, a rotor housing in front of said plate and dischargingrearwardly through said open,-

ing, a chamber for airin rear of said.plate just below said opening;said chamber having means for discharging air rearwardly intothefurnace, and means for conducting air from the chamber forwardly beneaththe opening vinto the housing.

20. In a stoker, an upright plate attachable to the front of a'furnaceand having an Qpel'ling therein through which fuel may be propelled intothe furnace, a rotor housing in front of said plate and dischargingrearwardly through said opening, a chamber for air in rear. of. saidplate below said opening, and two meansfor conducting aire from saidchamber forwardly into the rotor housingto be propelled with fuelrearwardly through the Opening in said plate, one of said meansextending through said opening and discharging toward the bottom of therotor housing, and the other of said means being beneath said openingand discharging upon the bottom of the rotor housing. I 1 r 21; Inastoker, an upright plate attachable to the front of a furnace andhaving an opening through which fuel may be propelled into the furmice,a rotor housing in front of said plate and.

right plate having an opening therein through which fuel may bepropelled into the furnace, a rotary impeller housing in front of saidplate aracetates.

ranged to discharge over the lower edge of said opening, a rotaryimpeller within said housing, an Y apron inclining rearwardly anddownwardly from the lower edge ofsaid opening and having air dis;-charge passages at its lower edge, and means for discharging airrearwardly through said passages from the lower rear edge of said apron.

23. In a stoker of the sprinkler type, a furnace front including anupright plate having an opening therein through which fuel may bepropelled into the furnace, a rotary impeller housing in front of saidplate arranged to discharge over the lower edge of said opening, arotary impeller in said housing, a stationary member extendingrearwardly from said furnace front, a grate in rear of said stationarymember, an apron above said stationary member inclining rearwardly anddownwardly from the lower edge of said opening and having air dischargepassages at its lower edge, and means for discharging air rearwardlythrough said passages from the lower rear edge of said apron whereby anydust and fine particles of fuel deposited on said apron and dischargingfrom the rear end thereof will-be carried bysaid air current rearwardand over the grate.

' ROYCE L. BEERS.

